I am trying to use Google Calendar API to access the calendar of various users in our organization calendars using OAuth2.0 and a service account but I get an error
"invalid_request" "Invalid impersonation prn email address.".
In the Google console I have:
- Created a project
- Created a service account and enabled "Domain wide delegation" and given the "Project Owner" role, then got a P12 key.
- In Security > Advanced settings > Authentication > Manage API client access I have given the serviceaccount access to https://www.googleapis.com/auth/calendar.readonly.
using System;
using System.Windows.Forms;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Calendar.v3;
using Google.Apis.Services;
using System.Security.Cryptography.X509Certificates;
namespace Google_Calendar
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button2_Click(object sender, EventArgs e)
{
string GoogleCertificate = @"testcalendar-209521-772939e76cae.p12"; // keyfile filename
string GoogleEmail = @"[email protected]"; // serviceaccount mail
string GoogleUser = "MyServiceAccount"; // serviceaccount name
string[] Scopes = new string[] { "https://www.googleapis.com/auth/calendar.readonly" };
X509Certificate2 certificate = new X509Certificate2(GoogleCertificate, "notasecret", X509KeyStorageFlags.Exportable);
ServiceAccountCredential credential = new ServiceAccountCredential( new ServiceAccountCredential.Initializer(GoogleEmail)
{
Scopes = Scopes,
User = GoogleUser
}.FromCertificate(certificate));
CalendarService service = new CalendarService(new BaseClientService.Initializer() { HttpClientInitializer = credential, ApplicationName = "testcalendar" });
string CalenderID = "[email protected]";
var CalRequest = service.Events.List(CalenderID);
CalRequest.TimeMin = DateTime.Now.AddMonths(-1); //optional parameter
CalRequest.TimeMax = DateTime.Now.AddMonths(+1); //optional parameter
do
{
var events = CalRequest.Execute(); // here I get the error
foreach (var item in events.Items)
{
// do stuff
}
CalRequest.PageToken = events.NextPageToken;
} while (CalRequest.PageToken != null);
}
}
}
Any ideas what the problem might be? I think the problem is in my settings in Google somewhere. Do I miss a step there?
